[error] DEADLOCK/NODUP: no remaining values
             C39
      +---------
39983 | 315B484A
       -60C664
        ======
         556034
        -575A50
         ======
          98613A
         -4A554A
          ======
           78258

base: 13
letters: 0123456789ABC
difficulty: medium
restrictions: no multiplication